- .The figure below is a force vs. displacement graph, showing the amount of force applied to an
object by three different people. Al applies force to the object for the first 4 m of its displacement,
Betty applies force from the 4 m point to the 6 m point, and Chuck applies force from the 6 m point
to the 8 m point. Which of the three does the most work on the object?
(A)Al
(B)Betty
(C)Chuck
(D)Al and Chuck do the same amount of work
(E)Betty and Chuck do the same amount of work- .When a car’s speed doubles, what happens to its kinetic energy?
(A)It is quartered
(B)It is halved
(C)It is unchanged
(D)It is doubled
(E)It is quadrupled - .A worker does 500 J of work on a 10 kg box. If the box transfers 375 J of heat to the floor through
the friction between the box and the floor, what is the velocity of the box after the work has been
done on it?
(A)5 m/s
(B)10 m/s
(C)12.5 m/s
(D)50 m/s
(E)100 m/s - .A person on the street wants to throw an 8 kg book up to a person leaning out of a window 5 m
above street level. With what velocity must the person throw the book so that it reaches the person
in the window?
(A)5 m/s
(B)8 m/s
(C)10 m/s
(D)40 m/s
(E)50 m/s
Que st io ns 9 and 10 re fe r t o a f ork li ft l i ft in g a crat e o f mass 10 0 kg at a co nst ant ve l oci ty